radeon and r200 have a driconf option that is similar to this.  It sets
a default initial max anisotropy value.  Maybe that would be better?

On 04/11/2016 11:48 AM, Marek Olšák wrote:
> From: Marek Olšák <[email protected]>
> 
> ---
>  src/gallium/drivers/r600/evergreen_state.c    | 10 +++++++---
>  src/gallium/drivers/r600/r600_state.c         | 10 +++++++---
>  src/gallium/drivers/radeon/r600_pipe_common.c |  7 +++++++
>  src/gallium/drivers/radeon/r600_pipe_common.h |  3 +++
>  src/gallium/drivers/radeonsi/si_state.c       | 10 +++++++---
>  5 files changed, 31 insertions(+), 9 deletions(-)
> 
> diff --git a/src/gallium/drivers/r600/evergreen_state.c 
> b/src/gallium/drivers/r600/evergreen_state.c
> index 6b6e816..2ad9e3e 100644
> --- a/src/gallium/drivers/r600/evergreen_state.c
> +++ b/src/gallium/drivers/r600/evergreen_state.c
> @@ -561,7 +561,11 @@ static void *evergreen_create_rs_state(struct 
> pipe_context *ctx,
>  static void *evergreen_create_sampler_state(struct pipe_context *ctx,
>                                       const struct pipe_sampler_state *state)
>  {
> +     struct r600_common_screen *rscreen = (struct 
> r600_common_screen*)ctx->screen;
>       struct r600_pipe_sampler_state *ss = 
> CALLOC_STRUCT(r600_pipe_sampler_state);
> +     unsigned max_aniso = rscreen->force_aniso >= 0 ? rscreen->force_aniso
> +                                                    : state->max_anisotropy;
> +     unsigned max_aniso_ratio = r600_tex_aniso_filter(max_aniso);
>  
>       if (!ss) {
>               return NULL;
> @@ -574,10 +578,10 @@ static void *evergreen_create_sampler_state(struct 
> pipe_context *ctx,
>               S_03C000_CLAMP_X(r600_tex_wrap(state->wrap_s)) |
>               S_03C000_CLAMP_Y(r600_tex_wrap(state->wrap_t)) |
>               S_03C000_CLAMP_Z(r600_tex_wrap(state->wrap_r)) |
> -             S_03C000_XY_MAG_FILTER(eg_tex_filter(state->mag_img_filter, 
> state->max_anisotropy)) |
> -             S_03C000_XY_MIN_FILTER(eg_tex_filter(state->min_img_filter, 
> state->max_anisotropy)) |
> +             S_03C000_XY_MAG_FILTER(eg_tex_filter(state->mag_img_filter, 
> max_aniso)) |
> +             S_03C000_XY_MIN_FILTER(eg_tex_filter(state->min_img_filter, 
> max_aniso)) |
>               S_03C000_MIP_FILTER(r600_tex_mipfilter(state->min_mip_filter)) |
> -             
> S_03C000_MAX_ANISO_RATIO(r600_tex_aniso_filter(state->max_anisotropy)) |
> +             S_03C000_MAX_ANISO_RATIO(max_aniso_ratio) |
>               
> S_03C000_DEPTH_COMPARE_FUNCTION(r600_tex_compare(state->compare_func)) |
>               S_03C000_BORDER_COLOR_TYPE(ss->border_color_use ? 
> V_03C000_SQ_TEX_BORDER_COLOR_REGISTER : 0);
>       /* R_03C004_SQ_TEX_SAMPLER_WORD1_0 */
> diff --git a/src/gallium/drivers/r600/r600_state.c 
> b/src/gallium/drivers/r600/r600_state.c
> index 59fe2f4..91e747f 100644
> --- a/src/gallium/drivers/r600/r600_state.c
> +++ b/src/gallium/drivers/r600/r600_state.c
> @@ -571,7 +571,11 @@ static unsigned r600_tex_filter(unsigned filter, 
> unsigned max_aniso)
>  static void *r600_create_sampler_state(struct pipe_context *ctx,
>                                       const struct pipe_sampler_state *state)
>  {
> +     struct r600_common_screen *rscreen = (struct 
> r600_common_screen*)ctx->screen;
>       struct r600_pipe_sampler_state *ss = 
> CALLOC_STRUCT(r600_pipe_sampler_state);
> +     unsigned max_aniso = rscreen->force_aniso >= 0 ? rscreen->force_aniso
> +                                                    : state->max_anisotropy;
> +     unsigned max_aniso_ratio = r600_tex_aniso_filter(max_aniso);
>  
>       if (!ss) {
>               return NULL;
> @@ -585,10 +589,10 @@ static void *r600_create_sampler_state(struct 
> pipe_context *ctx,
>               S_03C000_CLAMP_X(r600_tex_wrap(state->wrap_s)) |
>               S_03C000_CLAMP_Y(r600_tex_wrap(state->wrap_t)) |
>               S_03C000_CLAMP_Z(r600_tex_wrap(state->wrap_r)) |
> -             S_03C000_XY_MAG_FILTER(r600_tex_filter(state->mag_img_filter, 
> state->max_anisotropy)) |
> -             S_03C000_XY_MIN_FILTER(r600_tex_filter(state->min_img_filter, 
> state->max_anisotropy)) |
> +             S_03C000_XY_MAG_FILTER(r600_tex_filter(state->mag_img_filter, 
> max_aniso)) |
> +             S_03C000_XY_MIN_FILTER(r600_tex_filter(state->min_img_filter, 
> max_aniso)) |
>               S_03C000_MIP_FILTER(r600_tex_mipfilter(state->min_mip_filter)) |
> -             
> S_03C000_MAX_ANISO_RATIO(r600_tex_aniso_filter(state->max_anisotropy)) |
> +             S_03C000_MAX_ANISO_RATIO(max_aniso_ratio) |
>               
> S_03C000_DEPTH_COMPARE_FUNCTION(r600_tex_compare(state->compare_func)) |
>               S_03C000_BORDER_COLOR_TYPE(ss->border_color_use ? 
> V_03C000_SQ_TEX_BORDER_COLOR_REGISTER : 0);
>       /* R_03C004_SQ_TEX_SAMPLER_WORD1_0 */
> diff --git a/src/gallium/drivers/radeon/r600_pipe_common.c 
> b/src/gallium/drivers/radeon/r600_pipe_common.c
> index 490cf8b..a7477ab 100644
> --- a/src/gallium/drivers/radeon/r600_pipe_common.c
> +++ b/src/gallium/drivers/radeon/r600_pipe_common.c
> @@ -889,6 +889,13 @@ bool r600_common_screen_init(struct r600_common_screen 
> *rscreen,
>       rscreen->chip_class = rscreen->info.chip_class;
>       rscreen->debug_flags = debug_get_flags_option("R600_DEBUG", 
> common_debug_options, 0);
>  
> +     rscreen->force_aniso = MIN2(16, debug_get_num_option("R600_TEX_ANISO", 
> -1));
> +     if (rscreen->force_aniso >= 0) {
> +             printf("radeon: Forcing anisotropy filter to %ix\n",
> +                    /* round down to a power of two */
> +                    1 << util_logbase2(rscreen->force_aniso));
> +     }
> +
>       util_format_s3tc_init();
>       pipe_mutex_init(rscreen->aux_context_lock);
>       pipe_mutex_init(rscreen->gpu_load_mutex);
> diff --git a/src/gallium/drivers/radeon/r600_pipe_common.h 
> b/src/gallium/drivers/radeon/r600_pipe_common.h
> index 88879b7..a6abe09 100644
> --- a/src/gallium/drivers/radeon/r600_pipe_common.h
> +++ b/src/gallium/drivers/radeon/r600_pipe_common.h
> @@ -306,6 +306,9 @@ struct r600_common_screen {
>       bool                            has_cp_dma;
>       bool                            has_streamout;
>  
> +     /* Texture filter settings. */
> +     int                             force_aniso; /* -1 = disabled */
> +
>       /* Auxiliary context. Mainly used to initialize resources.
>        * It must be locked prior to using and flushed before unlocking. */
>       struct pipe_context             *aux_context;
> diff --git a/src/gallium/drivers/radeonsi/si_state.c 
> b/src/gallium/drivers/radeonsi/si_state.c
> index 84c8bc8..48d8897 100644
> --- a/src/gallium/drivers/radeonsi/si_state.c
> +++ b/src/gallium/drivers/radeonsi/si_state.c
> @@ -3163,8 +3163,12 @@ static void *si_create_sampler_state(struct 
> pipe_context *ctx,
>                                    const struct pipe_sampler_state *state)
>  {
>       struct si_context *sctx = (struct si_context *)ctx;
> +     struct r600_common_screen *rscreen = sctx->b.screen;
>       struct si_sampler_state *rstate = CALLOC_STRUCT(si_sampler_state);
>       unsigned border_color_type, border_color_index = 0;
> +     unsigned max_aniso = rscreen->force_aniso >= 0 ? rscreen->force_aniso
> +                                                    : state->max_anisotropy;
> +     unsigned max_aniso_ratio = r600_tex_aniso_filter(max_aniso);
>  
>       if (!rstate) {
>               return NULL;
> @@ -3222,7 +3226,7 @@ static void *si_create_sampler_state(struct 
> pipe_context *ctx,
>       rstate->val[0] = (S_008F30_CLAMP_X(si_tex_wrap(state->wrap_s)) |
>                         S_008F30_CLAMP_Y(si_tex_wrap(state->wrap_t)) |
>                         S_008F30_CLAMP_Z(si_tex_wrap(state->wrap_r)) |
> -                       
> S_008F30_MAX_ANISO_RATIO(r600_tex_aniso_filter(state->max_anisotropy)) |
> +                       S_008F30_MAX_ANISO_RATIO(max_aniso_ratio) |
>                         
> S_008F30_DEPTH_COMPARE_FUNC(si_tex_compare(state->compare_func)) |
>                         
> S_008F30_FORCE_UNNORMALIZED(!state->normalized_coords) |
>                         S_008F30_DISABLE_CUBE_WRAP(!state->seamless_cube_map) 
> |
> @@ -3230,8 +3234,8 @@ static void *si_create_sampler_state(struct 
> pipe_context *ctx,
>       rstate->val[1] = (S_008F34_MIN_LOD(S_FIXED(CLAMP(state->min_lod, 0, 
> 15), 8)) |
>                         S_008F34_MAX_LOD(S_FIXED(CLAMP(state->max_lod, 0, 
> 15), 8)));
>       rstate->val[2] = (S_008F38_LOD_BIAS(S_FIXED(CLAMP(state->lod_bias, -16, 
> 16), 8)) |
> -                       
> S_008F38_XY_MAG_FILTER(eg_tex_filter(state->mag_img_filter, 
> state->max_anisotropy)) |
> -                       
> S_008F38_XY_MIN_FILTER(eg_tex_filter(state->min_img_filter, 
> state->max_anisotropy)) |
> +                       
> S_008F38_XY_MAG_FILTER(eg_tex_filter(state->mag_img_filter, max_aniso)) |
> +                       
> S_008F38_XY_MIN_FILTER(eg_tex_filter(state->min_img_filter, max_aniso)) |
>                         
> S_008F38_MIP_FILTER(si_tex_mipfilter(state->min_mip_filter)) |
>                         S_008F38_MIP_POINT_PRECLAMP(1) |
>                         S_008F38_DISABLE_LSB_CEIL(1) |
> 

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